Xue Xiaoyuan, Li Huibin zhu bian ; Zhong gong zhong yang bian yi ju Zhongguo xian shi wen ti yan jiu zhong xin, Zhong gong zhong yang bian yi ju 'Makesi zhu yi yu xian shi' za zhi she bian
organised by the Bulgarian Society for the Conservation of the Rhodopi Mountains (BSCRM) and the World Wide Fund for Nature (WWF-International) ; [compiled by Dimo Datkov Bodurov, and others]
prepared for United States Agency for International Development under contract number PDC-5517-1-00-0105-00 ; prepared by Tropical Research & Development, Inc., John A. Lichte ... [and others]